This river is so big that it is impossible to build a _______ under it without modern technology. ( 章节：4 难度：2)
- A、canal
- B、tunnel
- C、channel
- D、cable
正确答案:B
答案解析:有
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This river is so big that it is impossible to build a _______ under it without modern technology. ( 章节：4 难度：2)
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